Cast
- Andy Lau as Senior Inspector Lau Kin-ming (劉健明, Jyutping: lau4 gin6 ming4, Pinyin: Liú Jiànmíng), Hon's mole in the police force
- Edison Chen as young Lau Kin-ming
- Tony Leung as Chan Wing-yan (陳永仁, J: can4 wing5 jan4, P: Chén Yǒngrén), an undercover cop in Hon's triad
- Shawn Yue as young Chan Wing-yan
- Anthony Wong as Superintendent Wong Chi-shing (黃志誠, J: wong4 zi3 sing4, P: Huáng Zhìchéng), Chan's superior
- Eric Tsang as Hon Sam (韓琛, J: hon4 sam1, P: Hán Chēn), the triad boss
- Chapman To as Tsui Wai-keung / "Crazy Keung" (徐偉強, P: Xú Wěiqiáng / 傻強), Hon's henchman
- Gordon Lam as Lam Kwok-ping / "Inspector B" (林國平, J: lam4 gwok3 ping4, P: Lín Guópíng / 大B, daai6B, dàB), Lau's subordinate who is actually also a mole in the police force
- Kelly Chen as Dr. Lee Sum-yee (李心兒, J: lei5 sam1 jan4, P: Lǐ Xīnér), Chan's therapist
- Sammi Cheng as Mary, Lau's girlfriend
- Berg Ng as Senior Inspector Cheung (張Sir)
- Wan Chi-keung as Officer Leung (梁Sir), the police chief
- Dion Lam as Del Piero (迪比亞路), Hon's henchman
- Elva Hsiao as May, Chan's ex-girlfriend
- Hui Kam-fung as Yip, principal of the police academy
- Chan Charoenwichai as Paul, the Thai drug dealer
Read more about this topic: Infernal Affairs
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